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2021-06-29 17:15:35 +02:00
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FAQ.md
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@@ -3725,15 +3725,15 @@ This feature requires an internet connection.
A spam block list is basically a list of domain names which have been used to send spam or to spread malware.
A spam block list is checked by resolving the domain name of an email address into an IP address
A spam block list is checked by resolving the server name from the last *Received* header into an IP address
and looking up the IP address with a DNS request:
```
example@gmail.com ->
gmail.com
gmail.com ->
172.217.168.229
DNS lookup 229.168.217.172.zen.spamhaus.org ->
Received:
... from smtp.gmail.com ...
smtp.gmail.com ->
142.250.27.108
DNS lookup 108.27.250.142.zen.spamhaus.org ->
127.0.0.2: spam
NXDOMAIN: not spam
```